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96e092dc73
WL#2474 "Multi Range Read: Change the default MRR implementation to implement new MRR interface"
WL#2475 "Batched range read functions for MyISAM/InnoDb"
"Index condition pushdown for MyISAM/InnoDB"
Igor's fix from sp1r-igor@olga.mysql.com-20080330055902-07614:
There could be observed the following problems:
1. EXPLAIN did not mention pushdown conditions from on expressions in the
'extra' column. As a result if a query had no where conditions pushed
down to a table, but had on conditions pushed to this table the 'extra'
column in the EXPLAIN for the table missed 'using where'.
2. Conditions for ref access were not eliminated from on expressions
though such conditions were eliminated from the where condition.
34 lines
844 B
Text
34 lines
844 B
Text
select @default_binlog_format:=@@global.binlog_format;
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@default_binlog_format:=@@global.binlog_format
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MIXED
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set global binlog_format=row;
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set session debug="+d,optimizer_innodb_ds_mrr";
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set autocommit=0;
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use test;
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drop table if exists t1;
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Warnings:
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Note 1051 Unknown table 't1'
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create table t1 (dummy int primary key, a int unique, b int) engine=innodb;
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insert into t1 values(1,1,1),(3,3,3),(5,5,5);
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commit;
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set session transaction isolation level repeatable read;
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select @@tx_isolation;
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@@tx_isolation
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REPEATABLE-READ
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start transaction;
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select * from t1 where a > 2 for update;
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dummy a b
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3 3 3
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5 5 5
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use test;
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set autocommit=0;
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start transaction;
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select 1;
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1
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1
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insert into t1 values(2,2,2);
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ERROR HY000: Lock wait timeout exceeded; try restarting transaction
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rollback;
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rollback;
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drop table t1;
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set global binlog_format=@default_binlog_format;
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